The right-click should display a sub-menu with 'Properties' as the last option. If 'Ask before pasting password from clipboard' is checked in Settings (Sticky password PRO 6.0.7.436), the sub-menu is not displayed. In stead I receive the confirmation question from SP: “Do you want to allow your password to be pasted from the clipboard?”

And if the clipboard has not been used by SP after the boot, the r/c menu in FF works flawlessly.

Is it your opinion that the misbehavior is caused by Firefox? Like the OpenOffice issue is caused by OOo, the EditPlus issue by EditPlus, the Notepadx64 issue by Notepadx64, the 25Clip issue by 25Clip?